And no, the state of US tanks isn't why the NA server is the least popular and smallest. The reason why is because of the matchmaker, the single most complained about part of the entire game, and the fact that the NA server is actually the newest of the three and still technically growing. It's probably not going to grow too much larger, but that's more attributable to the observation that NA in general hates non-mainstream games and generally follows the hype machine at large as opposed to supporting indie or off the beaten path titles, such as World of Tanks. You can see this behavior in just how unpopular E-sports are in the USA by direct comparison to Europe, if nothing else, even in popular games.
If it's not a big name AAA title, NA generally doesn't care. That's where the bigger problem is from.
Dang it if I don't agree almost completely with this bit. My biggest issue with WoT right now is that sometimes it just doesn't feel fun regardless of what tank you're in. Getting facerolled by tier 9/10 tanks while you're in a tier 7 just sucks, period. It doesn't relly matter much whether I'm in an IS or a Tiger(H), it just isn't fun to see an E-100 or BatChat roll into view and think, "Well, I'm hosed".
As for tank games being non-mainstream...I would love to see other arcade-ish tank games, and not because I want to see them run WG out of business for perceived wrongdoing. I just want more tank games because they're something I like and the market isn't already full of them. I'd go nuts if namco said they'd be publishing a tank counterpart to Ace Combat, or if a Seek and Destroy sequel/spiritual successor was announced. Unfortunately, tank-specific games tend to be a very niche market. The few that do get made tend to be super hardcore PC only sims, the kind of games I tend not to enjoy very much. Sadly, I think the pitch for the kind of games I want would go something like this:
Developer: So, we were thinking we'd do something a little different this time, maybe move into some less crowded markets-
Publisher: I don't like it already.
Developer: Hear me out. We'll make a game just about tanks. There's already plenty of games just about giant robots, and we're thinking it might work the same way.
Publisher: But it won't get me a money pool like John Riticello and Bobby Kotick. So no, not happening. Now here's a permanent marker. Your next "development" project will be to go into the warehouse where we have a bunch of discs of the latest Call of Duty offering and to replace the CoD logo with the title of "our" game: Call of Honor: Russia Invades America (Again).
Developer: I hate my life.
Publisher: Then my work is done here.
Me: Someone? Anyone? I will pay money for tank games. Cold hard cash. Right now. ...Please?